Heavy Duty Motor
Built for the extremes of mining, steel mills, and cement plants.
Heavy Duty Motor
WhatsApp for 15-min engineer call
Warranty
1 Year Standard
Service
Covered by Warranty
Certified
ISO 9001:2015
Experience
24 Years
Product Overview
The Sun Star heavy-duty motor is built around a reinforced cast iron frame that is significantly thicker and heavier than standard motor frames of the same power rating. The additional material mass serves two purposes: it provides structural rigidity against the shock loads and vibration common in crushing and grinding applications, and it acts as a thermal reservoir that absorbs transient overloads without excessive temperature rise. The shaft is manufactured from high-tensile EN8 steel, ground to h6 tolerance, with a larger diameter than standard motors to handle the high radial loads from V-belt drives common in crusher and mill applications.
Key Features
Technical Specifications
| Power Range | 0.5 HP to 20 HP |
| Voltage | 230 / 415V |
| Efficiency | High Efficiency / Premium |
| Duty | S1 (Continuous) |
| Cooling | IC411 (TEFC) |
| Frame | Cast Iron Heavy Duty |
Common Applications
Industries Served
Mining & Quarrying
Jaw crushers, cone crushers, vibrating feeders, and conveyor drives in open-pit and underground mining operations.
Cement Manufacturing
Raw mills, ball mills, kiln drives, clinker conveyors, and bag packing machines in cement plants.
Sugar Processing
Cane crushers, juice extractors, centrifuges, and bagasse conveyors in sugar mills across Maharashtra and UP.
Steel & Metal Processing
Rolling mills, cut-to-length lines, wire drawing machines, and furnace auxiliaries in steel and metal plants.
Key Benefits
- Withstands startup currents up to 7× rated current without insulation stress — designed for heavy loads that standard motors cannot break away
- VFD compatible with phase-to-phase insulation reinforcement — prevents voltage spike damage from PWM inverter drives
- Reinforced cast iron frame absorbs shock loads and vibration from crushing, grinding, and milling operations
Why Choose Our Motors
- Reinforced cast iron frame with through-bolted construction — not the stamped-and-welded frames used in standard motors
- Oversized shaft (typically one frame size larger than standard) handles high V-belt radial loads without deflection
- VFD-compatible insulation system tested at 1,600V peak — handles PWM drives up to 500V without additional output filters
Manufacturing & Quality
Manufacturing Process
Heavy-duty motor manufacturing uses reinforced castings that are 25–40% heavier than standard motor frames of the same power rating. The stator core stack length is maximised within the frame to increase the active material — this provides both higher torque capability and greater thermal mass. Winding is done with additional phase-to-phase insulation barriers (Nomex or equivalent) for VFD compatibility.
Quality Standards
- Full-load dynamometer testing (not just no-load)
- Locked-rotor torque verification against specification
- VFD compatibility insulation test at 1,600V peak
- Shaft straightness verified to ≤ 0.02mm TIR
- Enhanced vibration testing at full load on dynamometer
Certifications
Selection Guide
Heavy duty applications demand motors that can withstand high starting currents (up to 7× rated current) and sustained overload conditions. For jaw crushers and ball mills, select a motor with a service factor of 1.15 minimum and verify that the locked-rotor torque exceeds the crusher's breakaway torque.
Recommended For
Comparison With Similar Motors
| Feature | Sun Star Motors™ | Typical Market Motor |
|---|---|---|
| Frame Construction | Reinforced cast iron (25–40% heavier) | Standard cast iron frame |
| Shaft Size | One frame size larger than standard | Standard shaft for the frame |
| VFD Compatibility | Phase-to-phase insulation reinforcement | No additional VFD protection |
| Testing | Full-load dynamometer test on every unit | No-load test only |
| Starting Torque | Extra-high LRT for heavy breakaway loads | Standard locked-rotor torque |
| Service Factor | 1.15 (15% overload capacity) | 1.0 (no overload margin) |
Installation Guidelines
- Heavy-duty motors require substantial foundations — use a concrete plinth of at least 200mm thickness with embedded foundation bolts
- For V-belt driven applications, ensure the motor baseplate allows belt tension adjustment without compromising alignment
- Align the motor shaft within 0.05mm using laser alignment — crusher and mill vibration amplifies any misalignment
- Use anti-vibration mounts between the motor base and foundation for crusher applications where transmitted vibration exceeds 4mm/s
Maintenance Tips
- Grease bearings every 2,500 hours (more frequently than standard motors due to heavier loading) with high-temperature EP3 grease
- Monitor motor temperature continuously using embedded PTC or PT100 sensors (if fitted) — heavy-duty applications often operate near thermal limits
- Check V-belt tension and condition monthly — worn or slack belts increase motor current and bearing load
Troubleshooting Guide
| Issue | Possible Cause | Solution |
|---|---|---|
| Motor fails to start under load (trips on overload) | Supply voltage too low, locked rotor torque insufficient for the load, or mechanical jamming in the driven equipment | Measure voltage at motor terminals during start attempt — voltage should not drop below 80% of rated. Verify motor's locked-rotor torque exceeds the breakaway torque of the driven equipment. Check driven equipment for mechanical jamming. |
| Motor runs but draws excessive current | Overloaded beyond rated capacity, low voltage supply, or bearing damage causing increased friction | Measure actual load using clamp-on ammeter — current should not exceed 110% of nameplate FLA for extended periods. Check supply voltage. Inspect bearings for roughness or excessive play. |
Warranty Information
All Sun Star Motors™ heavy-duty motors carry a 12-month warranty from the date of dispatch, covering manufacturing defects in frame, windings, shaft, and bearings under normal operating conditions within the specified duty rating and ambient temperature range.
Quality Assurance • Sun Star Motors™